Issues with precision in dodecahedron model

[aaron_erlanger]

I'm a student and hobbyist in 3D modeling, so this may be a problem with an easy solution. I am working on a project where I have a regular dodecahedron whose faces have symmetrical features (the same features on each face). When I constructed the dodecahedron, I noticed a small asymmetry of around  0.015mm (each face has a side length of 70mm so I did not consider this an issue). However, after extruding a circle positioned at the center of a regular pentagonal face, I took more measurements and found that the asymmetry had expanded to around 1mm, which ended up throwing off the symmetry of the whole model. Is there any way for me to reduce this error?

Help greatly appreciated!

LINK TO PROJECT FILE: https://a360.co/46dFBNO

[TheCADWhisperer · Accepted solution]

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@aaron_erlanger wrote:

I'm a student ...

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Has your instructor covered the importance of fully defining sketches?

Where is your dimension in first sketch?

How many other sketches can you identify as not fully defined?

[aaron_erlanger]

I ought to mention that I'm a student of computer science -- not of 3D modeling. I am a hobbyist in 3D modeling. I see now that could be unclear from my original post! I'll read up on fully defining sketches and give this project another go tomorrow. Thanks for the advice.